Jaalbr,
I noticed that too... I've seen it on other MOs. I just had some body work done and they had to replace the rear bumper cover. Same issue after they finished and I talked to the body shop worker. Just as Sim stated there are very few fastners. I thought maybe not so bad, so if you get into an accident the cover doesn't take anything else with it????
However now that I see others say its secure I wonder. I noticed it is a bit loose near where the top of the bumper cover meets the rear quarter panel.
I wonder.....